Which part of the neuron is most closely associated with the speed with which it can convey an impulse?

The myelin sheath is the part of the neuron is most closely associated with the speed with which it can convey an impulse. The myelin sheath is a substantially prolonged and modified plasma membrane wrapped around the nerve axon in a spiral fashion. It permits indicators to be transmitted rapidly from the frightened system to the rest of the body.

The answer would be c

Iwould say overuse ( but not 100% sure ) in the u.s. we tend to overuse water by leaving it running, throwing it away, taking long showers, etc.